1338998161 has 2 divisors, whose sum is σ = 1338998162. Its totient is φ = 1338998160.

The previous prime is 1338998117. The next prime is 1338998197. The reversal of 1338998161 is 1618998331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034844561 + 304153600 = 32169^2 + 17440^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338998161 - 2¹³ = 1338989969 is a prime.

It is a super-2 number, since 2×1338998161² = 3585832150322763842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1338998261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669499080 + 669499081.

It is an arithmetic number, because the mean of its divisors is an integer number (669499081).

Almost surely, 2^1338998161 is an apocalyptic number.

It is an amenable number.

1338998161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338998161 is an equidigital number, since it uses as much as digits as its factorization.

1338998161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 49.

The square root of 1338998161 is about 36592.3237988516. The cubic root of 1338998161 is about 1102.1989514020.

The spelling of 1338998161 in words is "one billion, three hundred thirty-eight million, nine hundred ninety-eight thousand, one hundred sixty-one".